Line loss rate is an important index of economy and technology in power utilities. As the reconstruction of electric network has developed rapidly, the research about the influence of reconstruction of regional network on loss reduction has been in-depth. This paper expatiated on the problem of circumfluence of reactive power due to various types of double lines by the theory and the practical example, suggests the measure that the reconstruction scheme of electric network is decided by the rule of flowing power change of lines. Experimental results in the power grid of Dingxi City showed that the scheme is effect.
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